Spin-fermion model near the quantum critical point: one-loop renormalization group results. Academic Article uri icon

abstract

  • We consider spin and electronic properties of itinerant electron systems, described by the spin-fermion model, near the antiferromagnetic critical point. We expand in the inverse number of hot spots in the Brillouin zone, N, and present the results beyond the previously studied N = infinity limit. We found two new effects: (i) Fermi surface becomes nested at hot spots, and (ii) vertex corrections give rise to anomalous spin dynamics and change the dynamical critical exponent from z = 2 to z>2. To first order in 1/N we found z = 2N/(N-2) which for a physical N = 8 yields z approximately 2.67.

published proceedings

  • Phys Rev Lett

author list (cited authors)

  • Abanov, A., & Chubukov, A. V.

citation count

  • 136

complete list of authors

  • Abanov, A||Chubukov, AV

publication date

  • June 2000